D
David Pratt
Hi. I have been experimenting with mmap recently. I determined how to
read and write properly from it and so search and replace on large
files. The problem I am having is with replaces that are larger than
the mmap. In this instance I need to
* rewind
* resize the mmap to accomodate the text
* move some part of the text to a new location on the mmap so the new
text does not overwrite the old
* write the replacement text
When I try to use resize it gives me the following error;
SystemError: mmap: resizing not available--no mremap()
I pass size to mmap to begin with based on my filesize
size = os.path.getsize(filename)
m = mmap.mmap(f.fileno(), size)
I am attempting to give it new size by doing:
m.resize(size + size_diff)
size_diff is difference between original and what will be new file
size after the insertion.
Can someone provide some hint on resizing or its this a python bug?
Many thanks
Regards
David
read and write properly from it and so search and replace on large
files. The problem I am having is with replaces that are larger than
the mmap. In this instance I need to
* rewind
* resize the mmap to accomodate the text
* move some part of the text to a new location on the mmap so the new
text does not overwrite the old
* write the replacement text
When I try to use resize it gives me the following error;
SystemError: mmap: resizing not available--no mremap()
I pass size to mmap to begin with based on my filesize
size = os.path.getsize(filename)
m = mmap.mmap(f.fileno(), size)
I am attempting to give it new size by doing:
m.resize(size + size_diff)
size_diff is difference between original and what will be new file
size after the insertion.
Can someone provide some hint on resizing or its this a python bug?
Many thanks
Regards
David